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Antenna model
Reference frame

Technical Terms and Infromation
on GPS (GNSS) Environment Monitoring


Monitoring of the Earth's Environment (TOP)

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Meteorology
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Introduction

The page summarize information used to process GPS(GNSS) data accurate enough to monitor environment change of the Earth.

Changge of antenna model

Correct information on GPS antenna and use of accurate model of phase center variation (PCV) is must for accurate GPS processing. GPS antenna model (including satellite antenna) has been updated. To know the timing of the update is important to avoid false interpretation of nature based on GPS solutions. It's always good to check the possibility of antenna, antenna model, and reference frame changes when we find jump is GPS solutions.
ModelNotes GPS weekStart from
(DOY)
References
IGS08/igs08.atxabsolute model 16322011-04-17
(2011-107)
IGSMAIL-6354
IGS05/igs05.atxabsolute model 14002006-11-05
(2006-309)
IGSMAIL-5440
igs01.pcv
igs_01.atx
relative model

References
  IGS Antenna Working Group: Detailed description of IGS antenna files
  National Geodetic Survey - Antenna Calibrations: Antenna model made by NOAA NGS


Changes of reference frame

Changes of reference frame is also one factor which could induce offset of solution with the events.
Name GPS weekValid periods
(DOY)
Notes
IGS08 1632
present
2011-04-17
present
change with igs08.atx
IGS05 1400
1631
2006-11-05
2011-04-16
change with igs05.atx
IGb00 1253
1399
2004-01-11
2006-11-04
IGS00 1143
1252
2001-12-02
2004-01-10
IGS97 1065
1142
2000-06-04
2001-12-01
ITRF97
+ orbit adjustment
1051
1064
2000-02-27
2000-06-03
ITRF97 1020
1050
1999-08-01
2000-02-26
ITRF96 0947
1020
1998-03-01
1999-07-31
ITRF94 0860
0946
1996-06-30
1998-02-28
ITRF93 0782
0859
1995-01-01
1996-06-29
ITRF92 0730
0781
1994-01-02
1994-12-31
References
  IGS Reference Frame Changes: History of IGS reference frame
  ITRF: ITRF (main page)